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Real website/-application use cases where dependency injection was useful (excluding unit testing/mocks)?


Real website/-application use cases where dependency injection was useful (excluding unit testing/mocks)?

By : user3861781
Date : November 21 2020, 07:01 PM
seems to work fine Dependency injection is not about substituting components. It's about decoupling code, it helps keep cohesion high and coupling low.
Substituting components is just one (and not too common in my experience) of the things you can do with DI.
code :


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Should I make copies of my unit tests that use mocks and change them to a real database for integration testing?

Should I make copies of my unit tests that use mocks and change them to a real database for integration testing?


By : Harris R.
Date : March 29 2020, 07:55 AM
I hope this helps you . Depends on the tests, we'd need more detail about what they're doing.
However, if you just copy the tests you now have to maintain both copies. Perhaps you can have the same tests run in two modes. One mode uses a mocked infrastructure, the other using real (test) infrastructure. How you accomplish this depends on how you've done the mocking and how your configuration system works.
Unit Testing dependency injection

Unit Testing dependency injection


By : dr.sim
Date : March 29 2020, 07:55 AM
should help you out You'll get this error if one of the injectables module isn't included.
For instance, you have
code :
beforeEach(module('home'));
beforeEach(module('ui.router'));
beforeEach(module('home'));
Unit testing the dependency injection

Unit testing the dependency injection


By : user2859179
Date : March 29 2020, 07:55 AM
Any of those help Your current Service Locator Anti-Pattern is what makes your code difficult to test in isolation as well as makes the class misleading about what it actually depends on.
MainClass should be refactored to follow Explicit Dependencies Principle
code :
public class MainClass : IMainClass  
    private readonly ILogger logger;
    private readonly IDatabase db;

    public MainClass(ILogger logger, IDatabase db) {
        this.logger = logger;  
        this.db = db;
    }

    public void AddDetails(Data data) {
        //do some business operations 
        db.Add(data);
        logger.Information("added");
    }
}
public class ContainerInit {
    public static IContainer BuildContainer() {
        var builder = new ContainerBuilder();
        builder.RegisterType<MainClass>().As<IMainClass>().SingleInstance();
        builder.RegisterType<Database>().As<IDatabase>().SingleInstance();
        var logger = LoggUtil.CreateLogger();
        builder.Register(logger).As<ILogger>().SingleInstance();

        var container = builder.Build();
        return container;
    }
}
[TestClass]
public class MainClassTests {    
    [TestMethod]
    public void Should_AddDetails_To_Database() {
        // Arrange
        var mockDb = new Mock<IDatabase>();
        var data = new Data();
        var mainClass = new MainClass(Mock.Of<ILogger>(), mockDb.Object);

        // Act
        mainClass.AddDetails(data);

        // Assert    
        mockDb.Verify(_ => _.Add(data), Times.Once);
    }
}
Unit testing without dependency injection

Unit testing without dependency injection


By : Travis Hardin
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The difficulty in your above example comes when you try to test DamselRescuingKnight. Assume, you want to test that one (see below)
When to use stubs/mocks and when to use real objects in unit testing?

When to use stubs/mocks and when to use real objects in unit testing?


By : Jyoti Kumari
Date : March 29 2020, 07:55 AM
To fix this issue The why of mocking is to be able to write unit test that means a test which is: fast, isolated, repeatable, self validating and Thorough and Timely (F.I.R.S.T)
To be able to test a unit/module in isolation you may need to mock/stub any external module (database access, api call, logging system...).
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